.DeclarationHall{
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    
}
.top{
    width: 100%;
    position: fixed;
    z-index: 99;
    position: fixed;
}
.classify{
    width: 100%;
}
.content{
    width: 100%;
    margin-top: 22vw;
    position: absolute;
}